Date: Mon, 22 Jan 1996 13:36:59 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: bugs@freebsd.org Subject: dd /dev/mem ... Message-ID: <199601221236.NAA05157@labinfo.iet.unipi.it>
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Running 2.1R, I tried the following running as root:
dd if=/dev/mem bs=32k skip=512 count=1 | dd bs=32 count=1 | hexdump
and my P100 w/ 16MB was frozen: no keyboard, no mouse, everything
still on the X screen.
the manpage says "Only offsets within the bounds of /dev/mem are
allowed.", and 512*32K is right beyond the physical RAM. However, I
have run C programs which would read beyond the limit with no problems.
Is it a bug in /dev/mem, "dd" or me ?
Luigi
====================================================================
Luigi Rizzo Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it Universita' di Pisa
tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522 http://www.iet.unipi.it/~luigi/
====================================================================
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